Cannot able to make outbound calls

Dear all , I hope you are doing well 

Actually I'm facing couple of issues I hope to find a solutions with you 

First issue : I have done configuration of yeastar p550 pbx but still i cannot make outbound call however i can receiving incoming calls from out side .


Second issue : when i receive any calls from outside I cannot hear any voice from the outside destination and he also cannot hear any voice .

So i hope to find solution for this issues urgently , and I apricate your time 


thanks in advance  


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